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package org.jvnet.hk2.config.provider.internal;

import java.util.Map;

import jakarta.inject.Singleton;

import org.glassfish.hk2.api.Filter;
import org.glassfish.hk2.api.Injectee;
import org.glassfish.hk2.api.InstanceLifecycleEvent;
import org.glassfish.hk2.api.InstanceLifecycleEventType;
import org.glassfish.hk2.api.InstanceLifecycleListener;
import org.glassfish.hk2.utilities.BuilderHelper;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.config.ConfigBeanProxy;
import org.jvnet.hk2.config.ConfigListener;
import org.jvnet.hk2.config.ConfigSupport;
import org.jvnet.hk2.config.ObservableBean;

/**
 * @author jwells
 *
 */
@Service @Singleton
public class ConfigInstanceListener implements InstanceLifecycleListener {
    private final Filter filter = BuilderHelper.createContractFilter(ConfigListener.class.getName());

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.InstanceLifecycleListener#getFilter()
     */
    @Override
    public Filter getFilter() {
        return filter;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.api.InstanceLifecycleListener#lifecycleEvent(org.glassfish.hk2.api.InstanceLifecycleEvent)
     */
    @Override
    public void lifecycleEvent(InstanceLifecycleEvent lifecycleEvent) {
        if (!lifecycleEvent.getEventType().equals(InstanceLifecycleEventType.POST_PRODUCTION)) {
            return;
        }
        
        Map<Injectee, Object> injectees = lifecycleEvent.getKnownInjectees();
        if (injectees == null) return;
        
        ConfigListener listener = (ConfigListener) lifecycleEvent.getLifecycleObject();
        for (Object injectee : injectees.values()) {
            if (!(injectee instanceof ConfigBeanProxy)) continue;
            
            ConfigBeanProxy configBeanProxy = (ConfigBeanProxy) injectee;
            Object impl = ConfigSupport.getImpl(configBeanProxy);
            
            if (!(impl instanceof ObservableBean)) continue;
            
            ObservableBean ob = (ObservableBean) impl;
            
            ob.addListener(listener);
        }

    }

}
